The Use of Geomagnetic Field Strength Measurements to Produce Geo-Position Estimates for PSAT Tagged Marine Animals Beyond the Euphotic Zone

The introduction of magnetometers in PSAT has the potential to obtain tracking data at any depth. While combinations of irradiance and geomagnetic measurements are already practiced to obtain improved position tracks in the euphotic zone, this paper presents and compares the results of three experiments to obtain positional information beyond the reach of light. Building on these results, it concludes with a proposal for geoposition estimation methods that are suitable for any depth and provide measured rather than inferred tracks with defined margins of error.